From what I can tell, it is an exact dupe of the pricier alternative, Deborah Lippman's "Glitter in the Air"

Cons

This could be a pro, but this polish is VERY sheer. The pro side is that you can put another color underneath one coat of "Whimsical" and you can hardly tell the light blue base is even there. However, that also means that in order to achieve the look in the bottle, you need to find a color that closely resembles it. I felt like "Sea Spray" was a fairly good match.

Final Verdict: "Whimsical" is a very cute color. Coming from someone who is not a fan of the regular Revlon Nail Color line, and has desired Lippmann's "Glitter In the Air" for quite a while, I'm actually fairly happy with the Revlon alternative.